You rang?
I can only go by your pics and it doesn't help if it's just one and taken from an angle that distorts.
FACT: this lovely sage colorway has been re-issued quite a few times.
FACT: altho noone points it out except me,
Plumes has been issued OFTEN since it was first introduced in 1953. Too often to count. ( I would estimate about every 5 yrs from 1953 to 1999. After 1999, it was more often issued in other materials.)
Anyway, just going by what
@FlaTiger offered, I can only narrow it down to 70s or 80s (probably 80s). It would help if there was a tag since a 1985 Plumes will have a different tag from a 1988 Plumes, for instance. But without further info, that's all I can offer.
P. S. There is NO possibility it's from the 50s or 60s.